Shilgengar, Sire of Famine, and Cayth, Famed Mechanist

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• Cayth, Famed Mechanist on the battlefield

Steps

1. Activate Shilgengar by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters the battlefield, its fabricate ability triggers, putting a +1/+1 counter on it
4. Resolve the Shilgengar ability Repeat

Results

• Infinite artifact tokens
• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite Blood tokens